LIBS TASK OIGSCIEN 06 0620 03 2007 - TheAllPaperstheallpapers.com/papers/CIE/IGCSE/Chemistry (0620)/0620_s07_qp_3.… · 6 Aluminium is extracted by the electrolysis of a molten mixture

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

CHEMISTRY 0620/03

Paper 3 (Extended) May/June 2007

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials required.

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.

Write in dark blue or black pen in the spaces provided on the Question Paper.

You may use a pencil for any diagrams, graphs or rough working.

Do not use staples, paper clips, highlighters, glue or correction fluid.

DO NOT WRITE IN ANY BARCODES.

Answer all questions.

A copy of the Periodic Table is printed on page 16.

At the end of the examination, fasten all your work securely together.

The number of marks is given in brackets [ ] at the end of each question or part question.

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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

1 A major source of energy is the combustion of fossil fuels. (a) (i) Name a solid fossil fuel.

[1]

(ii) Name a gaseous fossil fuel.

[1]

(b) Petroleum is separated into more useful fractions by fractional distillation. (i) Name two liquid fuels obtained from petroleum.

and [2]

(ii) Name two other useful products obtained from petroleum that are not used as

fuels.

and [2]

(iii) Give another mixture of liquids that is separated on an industrial scale by fractional

distillation.

[1]

[Total: 7]


3

© UCLES 2007 0620/03/M/J/07 [Turn over

For

Examiner's

Use

2 Complete the following table.

type of structure

particles present electrical

conductivity of solid

electrical conductivity of

liquid example

ionic positive and negative

ions poor

macro

molecular

atoms of two different elements in a giant covalent structure

poor poor

and

metallic

good

copper

[Total: 6]


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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

3 There are three methods of preparing salts. Method A – use a burette and an indicator. Method B – mix two solutions and obtain the salt by precipitation. Method C – add an excess of base or a metal to a dilute acid and remove the excess by

filtration. For each of the following salt preparations, choose one of the methods A, B or C, name any

additional reagent needed and then write or complete the equation. (i) the soluble salt, zinc sulphate, from the insoluble base, zinc oxide

method

reagent

word equation [3]

(ii) the soluble salt, potassium chloride, from the soluble base, potassium hydroxide

method

reagent

equation + → KCl + H2O [3]

(iii) the insoluble salt, lead(II) iodide, from the soluble salt, lead(II) nitrate

method

reagent

equation Pb2+ + → [4]

[Total: 10]


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For

Examiner's

Use

4 Use your copy of the periodic table to help you answer these questions. (a) Predict the formula of each of the following compounds.

(i) barium oxide [1]

(ii) boron oxide [1]

(b) Give the formula of the following ions.

(i) sulphide [1]

(ii) gallium [1]

(c) Draw a diagram showing the arrangement of the valency electrons in one molecule of

the covalent compound nitrogen trichloride. Use x to represent an electron from a nitrogen atom. Use o to represent an electron from a chlorine atom. [3] (d) Potassium and vanadium are elements in Period IV. (i) State two differences in their physical properties.

[2]

(ii) Give two differences in their chemical properties.

[2]


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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

(e) Fluorine and astatine are halogens. Use your knowledge of the other halogens to predict the following:

(i) The physical state of fluorine at r.t.p.

The physical state of astatine at r.t.p. [2]

(ii) Two similarities in their chemical properties

[2]

[Total 15]


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For

Examiner's

Use

5 (a) Titanium is produced by the reduction of its chloride. This is heated with magnesium in an inert atmosphere of argon.

TiCl4 + 2Mg → Ti + 2MgCl2

(i) Explain why it is necessary to use argon rather than air.

[1]

(ii) Name another metal that would reduce titanium chloride to titanium.

[1]

(iii) Suggest how you could separate the metal, titanium, from the soluble salt magnesium

chloride.

[2]

(b) Titanium is very resistant to corrosion. One of its uses is as an electrode in the cathodic

protection of large steel structures from rusting.

+ –power

steel oil rigwhich is cathode

sea water containsH+(aq), OH–(aq),Na+(aq), Cl–(aq)

titaniumanode

(i) Define oxidation in terms of electron transfer.

[1]

(ii) The steel oil rig is the cathode. Name the gas formed at this electrode.

[1]

(iii) Name the two gases formed at the titanium anode.

and [2]

(iv) Explain why the oil rig does not rust.

[2]


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© UCLES 2007 0620/03/M/J/07

For

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(v) Another way of protecting steel from corrosion is sacrificial protection. Give two differences between sacrificial protection and cathodic protection.

[2]

[Total: 12]


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For

Examiner's

Use

6 Aluminium is extracted by the electrolysis of a molten mixture that contains alumina, which is aluminium oxide, Al2O3.

(a) The ore of aluminium is bauxite. This contains alumina, which is amphoteric, and

iron(III) oxide, which is basic. The ore is heated with aqueous sodium hydroxide. Complete the following sentences.

The dissolves to give a solution of

The does not dissolve and can be removed by [4]

(b) Complete the labelling of the diagram.

waste gases

carbon anode (+)

mixture of aluminium

oxide and .........................

................................

temperature is .........................

.......................

....................... (–)

[4] (c) The ions that are involved in the electrolysis are Al3+ and O2-. (i) Write an equation for the reaction at the cathode.

[2]

(ii) Explain how carbon dioxide is formed at the anode.

[2]


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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

(d) Give an explanation for each of the following. (i) Aluminium is used extensively in the manufacture of aircraft.

[1]

(ii) Aluminium is used to make food containers.

[2]

(iii) Aluminium electricity cables have a steel core.

[1]

[Total: 16]


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For

Examiner's

Use

7 Esters, fats and polyesters all contain the ester linkage. (a) The structural formula of an ester is given below.

C

H

H

H

H

CCO

O

H

H

H

H

C HH

H

H

C C

Name two chemicals that could be used to make this ester and draw their structural

formulae. Show all bonds.

names and [2]

structural formulae [2] (b) (i) Draw the structural formula of a polyester such as Terylene. [2] (ii) Suggest a use for this polymer.

[1]


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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

(c) Cooking products, fats and vegetable oils, are mixtures of saturated and unsaturated esters.

The degree of unsaturation can be estimated by the following experiment. 4 drops of

the oil are dissolved in 5 cm3 of ethanol. Dilute bromine water is added a drop at a time until the brown colour no longer disappears. Enough bromine has been added to the sample to react with all the double bonds.

cooking product

mass of saturated fat in 100 g of product / g

mass of unsaturated fat in 100 g of product / g

number of drops of bromine water

margarine 35 35 5

butter 45 28 4

corn oil 10 84 12

soya oil 15 70 10

lard 38 56

(i) Complete the one blank space in the table. [1] (ii) Complete the equation for bromine reacting with a double bond.

C C + Br2 [2] (iii) Using saturated fats in the diet is thought to be a major cause of heart disease.

Which of the products is the least likely to cause heart disease?

[1]


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© UCLES 2007 0620/03/M/J/07

For

Examiner's

Use

(d) A better way of measuring the degree of unsaturation is to find the iodine number of the unsaturated compound. This is the mass of iodine that reacts with all the double bonds in 100 g of the fat.

Use the following information to calculate the number of double bonds in one molecule

of the fat. Mass of one mole of the fat is 884 g.

One mole of I2 reacts with one mole C C.

The iodine number of the fat is 86.2 g. Complete the following calculation.

100 g of fat reacts with 86.2 g of iodine.

884 g of fat reacts with g of iodine.

One mole of fat reacts with moles of iodine molecules.

Number of double bonds in one molecule of fat is [3]

[Total:14]


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0620/03/M/J/07

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0620/03/M/J/07

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© UCLES 2007 0620/03/M/J/07

Gro

up

140

Ce

Cer

ium

58

141

Pr

Pra

seod

ymiu

m59

144

Nd

Neo

dym

ium

60

Pm

Pro

met

hium

61

150

Sm

Sam

ariu

m62

152

Eu

Eur

opiu

m63

157

Gd

Gad

olin

ium

64

159

Tb

Terb

ium

65

162

Dy

Dys

pros

ium

66

165

Ho

Hol

miu

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167

Er

Erb

ium

68

169

Tm

Thul

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69

173

Yb

Ytte

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m70

175

Lu

Lute

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71

232

Th

Thor

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90

Pa

Pro

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238

UU

rani

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Np

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um93

Pu

Plu

toni

um94

Am

Am

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ium

95

Cm

Cur

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96

Bk

Ber

keliu

m97

Cf

Cal

iforn

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98

Es

Ein

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99

Fm

Ferm

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100

Md

Men

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101

No

Nob

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Lr

Law

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7 Li

Lith

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3

23 Na

Sod

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11

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40 Ca

Cal

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20

45 Sc

Sca

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m21

48 Ti

Tita

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22

51 VVa

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52 Cr

Chr

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m24

55 Mn

Man

gane

se25

56 Fe

Iron

26

59 Co

Cob

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27

59 Ni

Nic

kel

28

64 Cu

Cop

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65 Zn

Zinc

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70 Ga

Gal

lium

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27 Al

Alu

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Arg

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20 Ne

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He

Hel

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73 Ge

Ger

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75 As

Ars

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79 Se

Sel

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e35

84 Kr

Kry

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otas

sium

19

88 Sr

Stro

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m38

89 YY

ttriu

m39

91 Zr

Zirc

oniu

m40

93 Nb

Nio

bium

41

96 Mo

Mol

ybde

num

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Tc

Tech

netiu

m43

101

Ru

Rut

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um44

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Rh

Rho

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Pd

Pal

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um46

108

Ag

Silv

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Cd

Cad

miu

m48

115

In

Indi

um49

119

Sn

Tin

50

122

Sb

Ant

imon

y51

128

Te

Tellu

rium

52

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I

Iodi

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Xe

Xen

on54

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Ba

Bar

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56

139

La

Lant

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Hf

Haf

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Ta

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WTu

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Re

Rhe

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Os

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76

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Ir

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Pt

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78

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Au

Gol

d79

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Hg

Mer

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80

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Tl

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81

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Pb

Lead

82

209

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Po

Pol

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At

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Rn

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Fr

Fran

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87

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Ac

Act

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m89

9

Be

Ber

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III

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VV

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85 Rb

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133

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55

226

Ra

Rad

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88

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LIBS TASK OIGSCIEN 06 0620 03 2007 - TheAllPaperstheallpapers.com/papers/CIE/IGCSE/Chemistry (0620)/0620_s07_qp_3.… · 6 Aluminium is extracted by the electrolysis of a molten mixture